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  4. As kinetic energy (K max ) is always positive, so

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Q. As kinetic energy $\left(K_{\max }\right)$ is always positive, so

Dual Nature of Radiation and Matter

Solution:

We know that, $K_{\max }=h v-\phi_{0}$
and hence if $K_{\max }>0$
$h v-\phi_{0} >0 $
or $ h v >\phi_{0}$